City of Melbourne – Preparation of road and park surface polygons
To assist with the registration and management of road and park assets, Council needed a series of surface polygons over the roads and parks within the municipality.
Preparation of Road and Park Surface Polygons
BackgroundThe City of Melbourne is developing and configuring an asset management software solution for all Council assets. To assist with the registration and management of road and park assets, Council needed a series of surface polygons over the roads and parks within the municipality.
ObjectiveA fully defined set of discrete polygons that represent particular assets within all roads and parks. The polygon boundaries were defined according to prescribed attributes including classification, type and material. Generally each polygon will represent a discrete asset within Council’s AMS.
Scope of ServicesCompile discrete polygons for all roads, reserves and parks under Council’s control including:
- Roadways and reserves
- Park areas within public land and Council controlled land
- Medians, roundabouts, splitter islands and physical lane delineation devices within roadways
Bridges, waterways and watercourses.
Kerb & channels
Tram super stops
Shrub beds (incl. garden beds)
Important considerations affecting the definition of a polygon include:
- Ensuring polygon boundaries are contiguous (ie. no overlapping or gaps)
- Maintaining spatial accuracy
- Creating line work that is geometrically correct and continuous
- Photogrammetric data of the relevant areas (varied between 1994 and 2002)
- Aerial photography
- Street and pathway segment information
- Park feature surveys where available
- CAD Layers for infrastructure
MethodologyThe methodology was complex and included:
- Evaluation of existing datasets and extraction of existing line work
- CAD plotting
- GIS data manipulation
- Cross section surveys
- High accuracy GPS surveys
- Total station feature surveys
- Field verification of materials and other attributes
- Topology checks and GIS data cleansing
OutputsProject deliverables included:
- An ArcMap shapefile showing all surface polygons and all required attributes
- An Excel spreadsheet containing the polygon ID, location, asset classification and surface material.
- A report of the project outlining any issues, constraints or techniques that the Consultant wishes to raise with Council.
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